Means for soldering aluminium.



UNITED sTArns PATENT orrron.

ARTHUR WILLIAM KING, OF LONDON, ENGLAND, ASSIGNOR TO CHARLES ROGERS, OF LONDON, ENGLAND.

manner-on SOLD'ERING ALUMINIUM.

Specification of Letters Patent.

Patented Feb. 6, 1906.

Application filed August 12, 1905- Saris-1N0. 273,978.

for aluminium. 7 By means of this special solder it is possible to unite aluminium coated therewith to either aluminium similarl tinned or to'another metal coated wit ordinary solder, the connection between the two coated surfaces in either case being then practicable by means of ordinary commercial soft solder. I

To repare the special solder which in the caseo the aluminium acts as a coating for the reception of ordinary solder, I melt together softsolder, which is generall composed of one part of tin and two parts 0 lead, zinc, andaluminium in the followin pro ortions: ten parts, by weight, of soft solder, ve parts, by weight, of ure zinc, five to eight arts, by weight, of a uminium. These ingre ients are conveniently melted in an iron pot until the mixture attains a low red heat and has been thoroughly well stirred and, mixed. I then pour the mixture into a mold, so that the finished s ecial solder or flux me be in the shape 0 strips, bars, cakes,or ot erwise.

In utilizing the above to enable me to solder aluminium to aluminium by means of ordinar soft solder composed of tin and lead I first clean the surfaces by scraping them bri lit-for example, with an old knife. Heat is t en a plied to the surfaces, preferably by means -0 a spirit-lamp, since this does not blacken the surfaces to be soldered. The above solder is then rubbed thereon (without the previoususe of spirits orresin) until it begins td adhere. so as to coat the aluminium,

and the coated surfaces are then cleaned by scraping or otherwise. Thereafter it is possible to unite the two coated pieces of aluminium by using ordinary soft solder, no spirits or resin being required to enable the ordinary solder to adhere to the above special solder.

In order to solder any other metal to alu- Ininium, I prepare the aluminium and coat it with the special solder, as previously described. The piece of other metal-c. 9., brass-is then pre ared and coated in the usual way with so t solder and either killed spirits of salts-that is, hydrocloric acid neutralized with zinc or resin-and the prepared surface then carefully cleaned and washed in, for example, water to emove all traces of the spirits or resin. T llS second metal and the aluminium, both differently coated, can then be soldered together and.

united by means of ordinary commercial soft solder, applying heat in the usual way.

The joint between the aluminium and aluminium or between thealuminium and brass will stand boiling in a solution of soda and is unaffected by weather.

In the case of refractory metal,such as iron, it may be necessary to use a hard solder for the iron.

r The special solder must be kept clean and free from grease. It must not come in contact with mercury or it will be spoiled and is then useless for the above purposes.

While I have referred to the soft solder as being composed of one part of tin and two of lead these proportions may be varied, and hence I do not wish to be limited to exact pro ortions.

aving thus described my invention, what I claim as such, and desire to secure by Let- VIo'roR F. FEENY CYRIL J. FEENY. 

